1Little David
One of the weapons U.S.A. would have used in the planned invasion of Japan was Little David, a 36 inch (914mm) mortar used to test aerial bombs. Converted into a mobile siege gun, it fired 3650 lb (1600 kg) shells at a range of 6 miles and would have been the largest caliber gun ever fielded.
2T13 Beano Grenade
The US Army during World War 2 developed a grenade (T13 Beano Grenade) the same size and shape as a baseball, to make it more effective for the soldiers who had grown up playing baseball.
3Mk 3 Centurion 169041
The Australian Mk 3 Centurion 169041 was nicknamed "The Atomic Tank" due to it surviving a 9.1kt blast from 460 meters away. The tank was simply driven off after the test and went on to spend another 23 years in service, including time in the Vietnam war.
4M65
The US military at one time invented the M65, the recoilless nuclear rifle. It fired nuclear rockets.
5Kamov Ka-50 helicopter
The Russian attack helicopter Kamov Ka-50 has an ejection seat. Before the rocket in the seat deploys, the rotor blades are blown away by explosives in the rotor disc.
6M2 Browning
The US military adopted the M2 Browning heavy machine gun in 1933, and still uses it extensively to this day.
7M1 Abrams
During Operation Desert Storm there were 9 American M1 Abrams tanks destroyed. All 9 were destroyed by Americans.
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8C-130 Hercules
The US military mounted rocket engines on a C-130 Hercules for a hostage rescue operation named Operation Credible Sport.
9Samsung SGR-A1
South Korea's military deployed robotic sentries armed (Samsung SGR-A1) with machine guns and grenade launchers. The system was designed to replace human-oriented guarding along the Korean Demilitarized Zone.
10HEL MD
The US Army has a prototype vehicle, the HEL MD, armed with a 50-watt laser cannon capable of taking down mortars and UAVs.
